/Engine/Plugins/Runtime/MassEntity/Source/MassEntity/Public/MassObserverManager.h
bool HasObserversForBitSet ( const [FMassTagBitSet](API\Plugins\MassEntity\FMassTagBitSet) & InQueriedBitSet, const [EMassObservedOperation](API\Plugins\MassEntity\EMassObservedOperation) Operation ) const